<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
    <div id="app">
        <input type="text" v-bind:value="message" v-on:input="valueChange">
        {{message}}
    </div>

    <script src="../js/vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                message: 'Hello'
            },
            methods: {
                valueChange(event){
                    this.message = event.target.value;
                }
            },
        })
    </script>
</body>
</html>